Marvair AVP 24 Manuel télécharger pdf (Page 21)

ComPac 6/09-18

2.4 porTinG anD DuCT Work (aVp24-72)

General Information

Note: The following instructions are for general guidance only. Due to the wide variety of installa-

tion possibilities, specic instructions will not be given. When in doubt, follow standard and accepted

installation practices, or contact Marvair

for additional assistance.

Wall Openings

Measure the dimensions of the supply and return ports on the unit.

Cut the openings in the exterior wall for the supply and return. IMPORTANT: All units with electric

heat must have one inch clearance on all four sides of the supply outlet duct ange on the unit.

The one inch clearance must extend on all sides of the supply duct for the rst three feet from

the unit.

IMPORTANT: Marvair

requires a minimum of one inch from the surface of any supply ducts to

combustible material for the rst three feet of the duct.

Ducting

Extensions should be cut ush with the inside wall for applications without duct work.

Applications using duct work should be designed and installed in accordance with all applicable safety

codes and standards. Marvair

strongly recommends referring to the current edition of the National

Fire Protection Association Standards 90A and 90B before designing and installing duct work. The

duct system must be engineered to insure sufcient air ow through the unit to prevent over-heating

of the heater element. This includes proper supply duct sizing, sufcient quantity of supply registers,

adequate return and lter area. Ductwork must be of correct material and must be properly insulated.

Duct work must be constructed of galvanized steel with a minimum thickness of .019 inches for the

rst three feet. Ductwork must be rmly attached, secured and sealed to prevent air leakage. Do not

use duct liner on inside of supply duct within 4 feet of the unit.

Galvanized metal duct extensions should be used to simplify connections to duct work and grilles. Use

fabric boots to prevent the transmission of vibration through the duct system. The fabric must be U.L.

rated to a minimum of 197°F.

Minimum Airow Requirements

The duct system must be engineered to assure sufcient air ow through the unit even under adverse

conditions such as dirty lters, etc. Use Table 6 below and Table 1, CFM at External Static Pressure

(Wet Coil) in section 1.4.

WARNING

FIRE HAZARD

Improper adjustment, alteration, service, maintenance or installation could cause serious

injury, death and/or property damage.

Installation or repairs made by unqualied persons could result in hazards to you and

others. Installation MUST conform with local codes or, in the absence of local codes, with

codes of all governmental authorities have jurisdiction.

The information contained in this manual is intended for use by a qualied service

agency that is experienced in such work, is familiar with all precautions and safety

procedures required in such work, and is equipped with the proper tools and test

instruments.

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Marvair AVP 24 Manuel Page 21

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